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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f40610106d2fa56152a697ab88629a59bf6bf77a3262f37e64349ef97d0efa8' 
  AND token = 'OBeWMOlJmW3Qn5JhCW+MYiedMpb0PK/VTO634e7Qv3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}